linux-kernel - Re: IO scheduler based IO controller V10

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Message-ID: <20091003072540.GW31616@kernel.dk>
Date:	Sat, 3 Oct 2009 09:25:41 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Mike Galbraith <efault@....de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Vivek Goyal <vgoyal@...hat.com>,
	Ulrich Lukas <stellplatz-nr.13a@...enparkplatz.de>,
	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, dm-devel@...hat.com,
	nauman@...gle.com, dpshah@...gle.com, lizf@...fujitsu.com,
	mikew@...gle.com, fchecconi@...il.com, paolo.valente@...more.it,
	ryov@...inux.co.jp, fernando@....ntt.co.jp, jmoyer@...hat.com,
	dhaval@...ux.vnet.ibm.com, balbir@...ux.vnet.ibm.com,
	righi.andrea@...il.com, m-ikeda@...jp.nec.com, agk@...hat.com,
	akpm@...ux-foundation.org, peterz@...radead.org,
	jmarchan@...hat.com, riel@...hat.com
Subject: Re: IO scheduler based IO controller V10

On Sat, Oct 03 2009, Ingo Molnar wrote:
> 
> * Mike Galbraith <efault@....de> wrote:
> 
> >  	unsigned int cfq_desktop;
> > +	unsigned int cfq_desktop_dispatch;
> 
> > -	if (cfq_cfqq_idle_window(cfqq) && cfqd->rq_in_driver[BLK_RW_ASYNC])
> > +	if (cfq_cfqq_idle_window(cfqq) && cfqd->rq_in_driver[BLK_RW_ASYNC]) {
> > +		cfqd->desktop_dispatch_ts = jiffies;
> >  		return 0;
> > +	}
> 
> btw., i hope all those desktop_ things will be named latency_ pretty 
> soon as the consensus seems to be - the word 'desktop' feels so wrong in 
> this context.
> 
> 'desktop' is a form of use of computers and the implication of good 
> latencies goes far beyond that category of systems.

I will rename it, for now it doesn't matter (lets not get bogged down in
bike shed colors, please).

Oh and Mike, I forgot to mention this in the previous email - no more
tunables, please. We'll keep this under a single knob.

-- 
Jens Axboe

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